SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8461657835ff910893f4ca024923c7ac38abe279e09404b7b5470cc87cb1125' 
  AND token = 'InDjVL0lI5woRiEYzDruJKkhYutRLIqgT1xO2Uqmxhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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