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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73018bdb76cd57f986049a4bd0acec8c3383bc5e28ae05864e99c97e35e1f76a' 
  AND token = 'DN2pHebs4OOuw2Dvt+DJeZxbOHH1TEFq8vKn1pz6C4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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