SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecaa908e523bb984b5641931c70a243e4f4e27e5765af24a11f1d9d152df862' 
  AND token = 'TyVjY/61NkPkgqMFzq/Ukg6XIH1TsGmd4h2p8AAuboM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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