Free images results:
 

Key pictures, stock photos and images

 
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Lock and key Stock Photo
Author: Ice
Key Stock Photography
Key
Author: Grandmaisonc
Portrait Stock Images
Author: Studio
The match Stock Photo
Author: Joseph
Glass Royalty Free Stock Photography
Author: Ladyann
Trakpoint_02 Stock Photos
Author: Bobb
Keypad Stock Photo
Author: Chuew
Starfish Stock Photos
Author: Sax
Real thing Royalty Free Stock Images
Author: I-bag
Blue Door Royalty Free Stock Photos
Author: Barsik
Keyboard Stock Photos
Author: Kurt
Withdrawal Royalty Free Stock Images
Author: Klikk
Onions Royalty Free Stock Photography
Author: Red2000
Door Royalty Free Stock Photos
Author: Suti
Locked Stock Image
Author: Kmitu
Guitar Stock Images
Author: Allein
Locked #2 Royalty Free Stock Image
Author: Kmitu
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Key Stock Photo
Key
Author: Okea
Skeleton key Royalty Free Stock Images
Author: Okea
Key Royalty Free Stock Images
Key
Author: Ghubonamin
Key fob Stock Images
Author: Zimmytws