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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be1508d01b1b5b85753cbb8459a4892c070cfa0fbda6d27b5ac4071660a4729' 
  AND token = 'njsQecqeBZRjS4bPpoGB99lYjaDfX9YWDnNPMS9iQk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

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