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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ed91fe517c9acb2da0a52efbd18258582bc46c84ba573db3de53550568bd38' 
  AND token = 'X9GeP0eNLuEIbb6E34Uhafe9QAnWB+/vFoJMC2sBAJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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