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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbdf94660b6a2da07a2225ddd1fbed8a9b415afd21418daffcb064008f6599e' 
  AND token = 'hM9NI13AX8XpkoPXP8w5Bq7uqVaRXseA3fiCPOtzQ94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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