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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41f71fa81cabc73bd102cbeaac2251e4e082ccd7845b705ea6168eba6b206cc' 
  AND token = 'pA19Agcamdy2qHlU6oq+EkHkKUKh5vV7lJYd2LgoBFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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