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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb3ece12c40eb0443954314d45e78dc772f79211b920f2b9e3b1cbbd47e89c9' 
  AND token = 'AAOgvLg5pDrIvPxg16a5mGbc6AlGz+wXy7PSVTFQoks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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