SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae78068669f2fa25b9e803c45cd8b9ab62984583f4f6a2fc64295ca21e1dafb' 
  AND token = 'ywFBGuwloh5ZMJ2XA/Bs3xJQJKXWzVXf1evRc6SYOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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