SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a00508633f03f2712a661558a4043fc865cb09164be4f466aa59e179f43ab86' 
  AND token = 'OL4ojrq+Kip9itw9RaVP7ljUGsfAd7+K7BLJQTYS3aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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