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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a35f51ed81e259426ecdf8f1743d0f3a51d49f88cdede15bf491c3f0616d0f' 
  AND token = 'Rogt0RcSVUff0xwOXYoAB5Hjz75tXjkMHOTW80ICx6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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