SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65560c7331c743406175dc71d0650b8cf0bd99be14099e7ab364d8f9d9a82c42' 
  AND token = 'KHAhYDmFGP34KeMV7AoWmbs3vEKJ2pljJiqweBFCsKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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