SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0165a50e91012e2bdd7ffc75a4bad8b14d1030444129632fd37b7f8652b6395d' 
  AND token = 'gcuxiWVglOVqwzB+LG5h0ZKpPc7ftKAJOjWhBIyVv+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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