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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1404432a0b107b54ec1a33616b044a21de7298c7590195655eb66ea03613b405' 
  AND token = 'xNgZpvsdnGrhsfYoNEaUGuY78ZgxYFsYssE7TRByxT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

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