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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57f183d5e6764bada0ebd93695344237686763ff3b374b1268283c86d21eafc' 
  AND token = 'q+11ihDUehZCGo4bLinP+hx6M3utk5vRyb/PXNU7/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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