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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff8540049afb49de814823dd0acf115812145f6489d388fe2d452a43f648ceb' 
  AND token = 'oylq54O1rjggPunq4uD4A5ewHg+7KhBLkhMxTHLyIpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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