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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b1d1947bc642cc7727d79fb4b3fc7c38ba857f62d86167868e2f0288206f61' 
  AND token = 'tpsMkKjUMD4nXml4IljtgQhwUYQislODbnSj2988U3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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