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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc5891e60c8e2ff6b097e6e26fe1dbe5465661a2514c262918793f975705447' 
  AND token = '+quBH0z8RiuhrzfiYKbeu0pi544LAIQZUdTzOFyoy0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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