I have searched online, and I haven't found a way to delete past searches from Recent Searches in the Photos app. I also believe that there may not be a way to do this on the current iOS, so maybe there should be an edit/clear recent searches button for the Photos app in the upcoming iOS update? That'd be nice.
iPod touch, iOS 9.3.2
There is no way to suppress the list of recent searches. It is fully automatic. Just ignore the suggestions until they are replaced by newer ones.
http://help.apple.com/iphone/9/#/iph3d267610
Search photos. From Albums or Photos, tap to search by date (month and year), or place (city and state). Search also keeps your Recent Searches on hand and gives you a list of suggested searches.
Search for other things, it'll rewrite on the old ones. Right now that's the only way...
How do you delete Recently Searched searches in the Photos app?
