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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef5be418db06dcd0a1b199fe326ac447c29124e91e77e18819de86bfc7fc4fd' 
  AND token = '47Ku+YTqAzly0mIlCihmd/epOv4exb4mrfvr7r8HZ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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