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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fe6935eb936a43ce037b4dc773330a59010cdf00a2fde6afc1c5b421d8d8c0' 
  AND token = 'QPRwsxrwLI0uhucJP9b4MdXM1wxsCEUMWn5Kab4Kd1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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