SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f010f8695678a71ebc8e2ae8c335e80d0b95e7bee30470b0f14b359c412728a' 
  AND token = '2ypHUPwZySlOaUMoo/OL36rKYG4qtxiJLvVmVT+tdrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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