SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba006c5750a6bf549769dd45c9e343adc5816ac9093c432ce387047e262fd30' 
  AND token = 'CDTk3XuDZV2yFDxpdKml1HFLG6QOzJ/pfdXGPqBFiRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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