SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf04cdf784d5b17647ebe85842253d922e59ef4d0cc02dc7d5b1875a9f853d10' 
  AND token = 'O12srw3zrnoZVfPjoHSfJZ0w4ph1/uWZCZEpYWFsXlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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