SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039ba3d1c72696af860be1d265f5b41b0d0cdcf9857685128a36300447e6c6dc' 
  AND token = 'Hgq/tUhhgbiIPja6XNjYwNojanUZK5QAOZEfq+gIA+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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