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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb0ca51592c1ef3c43d658e6d4c9be07e8fb463b7cb7f1f39b33493817e74ef' 
  AND token = 'qu/4xoQc98aUZ6zNKVs9ePEkvonlddU4xQVZMsQDh/4=' 
  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