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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265835b6f8dc3c22b8ace581ad2c94c9bcef501631b2f05d40273464628f78f2' 
  AND token = 'gugBtjktoCYX6xzWcKAS6IIaqoiof2x56I95SDCYtQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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