SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f9f21e87fb26f4704e6b91dc112c7608905703b0f98ad3196f6186d38f3b5b' 
  AND token = '9/9jB52MK8A5MgkU+l4fP/mA/+xo3Lgo+wuPMquUH/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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