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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4ce4173f525b2cc38db0db34215b959aa379103a3ac0e34dc66048bbc96f02' 
  AND token = '6W/t3Up9z5cU0QltOorWlvu7drvjUuHY2fR0Aro6+uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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