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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f96c0d73705cb93106e3056c0e17e8e423fd330d90494ba1791dbb9253024d' 
  AND token = 'E5tuVFnAjE/Nj81X8/56weFomDlaa1d2t5F4koYhX4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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