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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3feb7d2518e337fe5275a24ee84e7f91e1c5bcd7961ede27b6445a83f5218b14' 
  AND token = '2+Bij++ocNSmf0ZKJ4DijIUDH3+PXlLIUi8EjFFn+YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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