SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f813cc69f17c8c5ff26708db9552b24d54a616882f7e3db4db2ef4208163b70' 
  AND token = 'nzbJ1TDmryoiFuuxFGAWlVsicijBIUkRZDYNNZ3iEBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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