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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad433407a7487a693a4474534d691c79483e62dfdae7a1fe091cc13fa375268' 
  AND token = 'ibnCKuavCsEuXnIW7CwZrMldL45veReLf473bl3XFeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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