SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed92cb72d5dd3e9466924170895b31e81b4af52e725d4222f379eef5daa1e867' 
  AND token = 'HIYTHLh1kcSZ4biwXgi+HuVjmf6s2dqeGA/ifcvuoEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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