SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b9a43b286075cc1f1c8f391b9173d67d345362983bdc7283793ddcbdee4174' 
  AND token = '4hPzXlm9kozRMLPAZ3LP+kBwqKn3s/sBCC/x9GKemyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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