SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea99b120a9c7d90160a5d7882a655361857ce3a1a4df89757ba00d53fed01254' 
  AND token = 'CZhgpe9tMOJ1wh+furzj3GrI2UT3REJLwj+EIW+Cvqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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