Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b3571835ac5b52d4bb9523bc2da603b560bcc4bb6924f9eb3d0511eece9412' 
  AND token = 'xXXX4YguwLLBzIn3XcQsyE9sq68TvpRorzO//kyBFKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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