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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545ec306b858413ad1131a36db9dca4ba72912084a5a34f5e1b8b58e2ec83bad' 
  AND token = 'CsTzubH49odHdZqqgnLQVTNkAECJ8TWB18lfyvIo3Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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