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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540fbc96ec23de9c32658376317d4058425c69920fab76a36ae4983d16223eee' 
  AND token = 'BbWxYxGZu2Rg77TbSj9hjDM9ww1Y0rbZNHi19G50Nig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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