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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4c7d413695ffd0edced3d819ae3db1c17b66e7d69a10a7673496c29189b56' 
  AND token = 'g9pRc8YpGIrbtibUIMK2/tGbaf7n+99XXh1YoLJanPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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