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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e92ad778beb4e5bc79a6e2baea0b3071c468387980eb6f8fab8d1ea3b774c0' 
  AND token = 'qZyhBqWGIGIVHSAn1plEbv49IaZJgbEFrA2hzyYOQGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables