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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61cd87e348ee23691f6c3d796c50344413585da77f0617fb15a705133041fcc' 
  AND token = 'Bg+k42RxT8H53/jssTBnTRzG6BkF6GBZwn4VUTdqGfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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