SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f976d540b56a61679f5594edb60f03237590948c99f85444b5640fa0110514c' 
  AND token = 'JHazTDJmVmdHJLjJm9Km5INSG7LVvcUXMj6W7BNhzwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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