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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeab1a28947efbd3d2ba7fd833396e02977e8cdf4ba35bb8f58f72fff56b9f2' 
  AND token = 'FIQdEPj42G1qR83Skl7yojBBroqfVt4PKNSlgoQAMK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

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