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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799c410e4a53762ac6b9b3631d29f5846f325c81002277c1b555580c94d670d5' 
  AND token = 'GvA9Ew04c1VYLNR9KOvH3xs0rFDQTSFn05ZfJlqQ9cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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