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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56f7124943b9c1c93488989fa029e6f97e95df2fc8d6664a7c7ce4a520b9bb4' 
  AND token = 'knNX6L7r136m8opea3jKI00cfhodvT85yuV85GQlI0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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