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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b613fb53b7736be56e8c408ef64994ac784752f90bc3d9575a32f49fe72fad27' 
  AND token = 'XrCnEPgZl3jT5LsHCilsSyIUZ2w7G1L8boK3vp83mlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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