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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6786a1473efb175040e6170a730cb64adf352ea8a3f15f0df142df8a72f366e8' 
  AND token = 'hpVr8Z1N0OpnnJVlRBa06tZ8MXTXUOAmVrV/G4PpKC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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