SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cee5e278ff82a51fe1ddcef8657b9584799e7d7621c834824c694083a507a1' 
  AND token = 'JJ/svJJ2BrZRL93WwXQfKlowqK/n6dV7HU3hoUPEyAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}