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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88a9d81542b8badff0060b4a696d583f1232de98e3ece610ec5faab640f7ed8' 
  AND token = 'HHoSISrjU3Z9WAxvWC77jvXYrKuNetJTxy731hxRrms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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