SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9086c63c1abc271c78c9d8cd0a13c219efb365807ae624ff1797a24ddf6f2bc7' 
  AND token = 'jyyHezm+ozZROuQLWJyySXGC75/N3m3ZrKFzkcfVvwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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