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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e4f3f89ca06b445d92485bdd90231f2246a411805f1d58f256882db36f4574' 
  AND token = 'yBRAMHOUN0Dxk67bBrHE2epfYuc2UAvidlxFo6lTJWQ=' 
  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