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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bc0ffb4be1630f2417bf9b28236371d3f5af0073b3e3b306434a88291a3f4a' 
  AND token = 'kS0/dlx6upBI4zdL3AZDu8PcGc6B6GfQI/Iu4Knjr/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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