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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f24cbecf9030f91ed88db6c26b17c2d4f88a8e4ddcd73a75a9683ebc7df78b6' 
  AND token = 'Zg09TyfIH7pT1E4LvLy3Lkty7RozmwAjDmM0vB9p9ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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