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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c820325512b07cd52591eede86900f24488802870408255bd0d752b70c2792' 
  AND token = 'mg/fLu7XNAtyrIr04F/wyNAp1qBWTrw1JHsovJf2n+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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