SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb386cff3d68141b432f1f0392b6f21eacc8f477250acb64d7286e00bb90f85' 
  AND token = 'JlaUMFqizb88YRjGz6YhQ4C02BZX7c7Z1Fil4Sr5Yng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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