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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856b43de51e1e9b90cc416a40b2ed9c2b97e7b741e3783d6830ad4748675c677' 
  AND token = 'nnjYj/1isPhOjU4fp43PLd5AcDbgZhaDWqlOOuksRmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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