SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee015b2752905a890d7dc598a9bd7f6ba45618d56d58d744a23fd18fcbcc4a5' 
  AND token = 'H+EAvhlSfrkBTNnjjyG5VrrZOxW17hq/f3+0KioyRw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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