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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3935220f109da743e457a3bedac94d0efc709e03f680129a29a5a9060ec69ee' 
  AND token = 'PqZupt8PRmb776Je9zaj4ff0lH1uR1EobEJnA+txpN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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